/**
 * The class Producer implements a producer.
 * @author Stephan Fischli
 * @version 1.1
 */
public class Producer extends Thread
{
   public static final int PAUSING = 0;
   public static final int PRODUCING = 1;
   public static final int WRITING = 2;

  /**
   * The buffer used by the producer.
   */
   private Buffer buffer;

  /**
   * The state of the producer.
   */
   private int state;

  /**
   * Constructs a Producer object.
   * @param buffer the buffer to be used by the producer
   */
   public Producer( Buffer buffer )
   {
      this.buffer = buffer;
      state = PAUSING;
   }

  /**
   * Returns the state of the producer.
   */
   public int state()
   {
      return state;
   }

  /**
   * Starts the producer.
   */
   public void run()
   {
      while ( true ) {
         pause();
         Object data = produce();
         write( data );
      }
   }

  /**
   * Lets the producer pause.
   */
   public void pause()
   {
      state = PAUSING;
      int time = (int)(20000*(0.5 + Math.random()));
      try { sleep( time ); }
      catch ( InterruptedException e ) {}
   }

  /**
   * Lets the producer produce data.
   * @return the produced data
   */
  public Object produce()
   {
      state = PRODUCING;
      int time = (int)(10000*(0.5 + Math.random()));
      try { sleep( time ); }
      catch ( InterruptedException e ) {}
      return new Object();
   }

 /**
   * Lets the producer write data to the buffer.
   * @param data the data to write
   */
   public void write( Object data )
   {
      state = WRITING;
      buffer.put( data );
   }
}